The sound is an indicator of several issues such as low oil level, ill-adjusted valves, rod knock or noisy lifter.
I am trying to identify the cause of a knocking sound coming from the number 6 or 8 cylinder on my 427. Naturally, this effect is enhanced as the ambient My buddy was driving my 2006 Chevy equinox awd the other day when the car got hot and cut off they put water in it Jumpstart ed the car and drove it home it would not drive over 25mphalso there's a rattling noise coming from either the top or bottom in front of motor the car will run and stay running with no problems except the rattling noise sound like a chain being pulled down set of metal I have a 12 year old diesel car which I have owned for 9 months now. Could this be a pushrod for the mechanical fuel pump? when I start in the mornings and press the gas, I hardly hear this sound. The noise may be described as “ticks,” “taps,” “knocks” or “thumps. During warm up the motor sounds fine, but after about 10 minutes or so the knocking / clicking / tapping sound starts. Knocking at idle, warm, cold, any status. Next component causing rough idle when warm is PCV Valve. This is because at low rpm the fuel ignites early when it meets the high temperature. Hello all, 3 days ago i picked up my Shiny new Skoda Fabia diesel 1. the car is costing a lot of money to repair & still not right. Usually, it is caused by reciprocating components like valves, pistons, rods and pushrods. Cackling or Knocking Noise Complaints on Ford 7. Uncontrolled combustion in Petrol engine is known as knocking and in Diesel engine its called as detonation. “How does knocking happen in a diesel engine?” Engine knock by definition is an incorrectly occurring combustion event. Started making cold engine knocking noises about a month ago. When the driving is cold, the noise appears after approximately 30 seconds, so the engine is not really hot. Duramax Diesel Warm Engine Idle Knock Sound ApSome 2020-2021 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with the 6. 
Knocking is still present but much quieter. The engine has always made a slight rattling noise when cold, but lately the noise is getting louder and seems to happen even when the engine has warmed up.
Common Rail Diesel (CRD, CD, CDI) problems can be incredibly expensive to fix! Typical CRD/CD/CDI set-up. Knock in a diesel is not like that of preignition in a gasoline engine. A diesel engine can ping, cling, clang and bang, and all the time you are wondering just what is acceptable and what is not. It sounds like a rod knocking when I first start it up but after it warms - Answered by a verified Ford Mechanic We use cookies to give you the best possible experience on our website. You will find that most are down to 3 minutes before you put a load on the engine. Diesel knocking when warm Took it to a diesel specialist and he aid that the injectors were shot so I bought a recon set from a chap on eBay with new tips fitted.
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